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Note 19 - Earnings Attributable to Tennant Company Per Share - Computations of Basic and Diluted Earnings (Loss) Attributable to Tennant Company Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Earnings Attributable to Tennant Company	$ 33.7	$ 45.8	$ 33.4
Basic - Weighted Average Shares Outstanding (in shares)	18,349,724	18,118,486	17,940,438
Effect of dilutive securities (in shares)	285,278	334,659	398,131
Diluted - Weighted Average Shares Outstanding (in shares)	18,635,002	18,453,145	18,338,569
Basic Earnings per Share (in dollars per share)	$ 1.84	$ 2.53	$ 1.86
Diluted Earnings per Share (in dollars per share)	$ 1.81	$ 2.48	$ 1.82

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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